Harden SSH on Ubuntu 24.04: Disable Root, Use Key Auth, Restrict IPs
Learn how to harden SSH on Ubuntu 24.04. Disable root login, enforce SSH key authentication, and restrict IP access for maximum protection. Table of Contents 🔈Introduction Secure Shell (SSH) is the backbone of remote system management, but an exposed or misconfigured SSH service is a prime target for attackers. Ubuntu 24.04, as a modern Linux […]
How to Monitor SSH Logins Using Auditd and Logwatch
Learn how to monitor SSH logins using Auditd and Logwatch on Linux. This step-by-step guide covers setup, configuration, log analysis, and reporting to enhance server security. Table of Contents 🔈Introduction Secure Shell (SSH) is one of the most widely used methods for remote server administration. Because it provides a gateway into critical infrastructure, monitoring SSH […]
Fixing the Apache Error: Invalid Command ‘Header’
Learn how to fix the Apache error “Invalid command ‘Header’” when configuring a web server. Step-by-step guide with CLI commands, configuration examples, and troubleshooting tips to get your Apache server running smoothly. Table of Contents 🔈Introduction When running a web server, nothing is more frustrating than Apache failing to start because of a cryptic configuration […]
How to Enable Fail2Ban to Block Repeated Failed Login Attempts on Linux
Learn how to configure Fail2Ban to block repeated failed login attempts on Linux. Step-by-step guide with commands, configuration examples, and security tips for SSH and other services. Table of Contents 🔈Introduction In today’s threat landscape, brute-force attacks are a common way attackers attempt to gain unauthorized access to Linux servers. A simple and effective defense […]
Understanding Regular Expressions: A Beginner’s Guide
Learn the basics of Regular Expressions with this beginner’s guide. Discover how to use regex for text searching, validation, and data extraction in Linux, programming, and more. Table of Contents 🔈Introduction Regular Expressions (regex) are an essential tool for anyone working with text processing or data extraction in Linux, programming, or even everyday tasks. While […]
How to Use grep for Advanced Search in Linux: A Comprehensive Guide
Learn advanced grep techniques to search files efficiently in Linux. Discover how to use regular expressions, case-insensitive searches, recursion, and more with practical examples. Table of Contents 🔈Introduction In the world of Linux, grep is an indispensable tool for searching through files and data streams. Whether you’re a system administrator, developer, or data scientist, understanding […]
Understanding File Compression in Linux: A Guide to gzip, bzip2, and xz
Learn how to use gzip, bzip2, and xz for file compression in Linux. This guide compares each tool’s speed, compression ratio, and best use cases, helping you choose the right one for your needs. Table of Contents 🔈Introduction In the world of Linux, file compression is an essential skill that every system administrator, developer, and […]
More vs Less Command in Linux: Which Is Better?
Explore the differences between the more and less commands in Linux. Learn which command is better suited for large files, searching, and efficient navigation. Table of Contents 🚀 Introduction Linux users often encounter long outputs in the terminal, whether it’s from running system commands, viewing log files, or analyzing process information. In these situations, it’s […]
How to Deploy GFS2 on Encrypted Volumes in a Clustered Multipath Storage Environment
Learn how to securely deploy GFS2 on encrypted volumes over multipath storage in a high-availability Linux cluster. Includes CLI examples, automation tips, and best practices. Table of Contents Introduction In modern enterprise IT environments, the need for secure, resilient, and high-availability storage systems is more critical than ever. Combining GFS2, multipath storage, and LUKS encryption provides a […]
Comparing VPN Protocols: WireGuard vs OpenVPN vs IPSec
Compare the top three VPN protocols—WireGuard, OpenVPN, and IPSec. Learn about their security features, speed, compatibility, and best use cases to choose the right protocol for your VPN needs. Table of Contents 🚀 Introduction Virtual Private Networks (VPNs) have become an essential tool for safeguarding online privacy, securing remote connections, and bypassing geographical restrictions. However, […]